Guide structure for die stocks



April 21, 1936. T. PETERSEN GUIDE STRUCTURE FOR DIE STOCKS Filed Oct. 17,1933

INVEN TOR.

A TTORNEYS.

Patented Apr. 21, 1936 PATENT OFFICE GUIDE STRUCTURE FOR DIE STOCKS Thorvald Petersen, Erie, Pa., assignor to Reed Manufacturing Gompany, Erie, Pa., 2. corporation of Pennsylvania Application October 17, 1933, Serial No. 693,938

4 Claims.

Many types of die stocks are provided with guides arranged concentrically with the chasers,

or screw cutting parts of the stock and adapted to maintain the cutting devices in alinement with the pipe. It is desirable to make these guides adjustable so that they will operate on different sizes of pipe and the present invention is designed to simplify the structure of the guide so that it may be readily adjusted and will, when adjusted, retain its adjustment. Features and details of the invention will appear from the specification and claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing as follows:--

Fig. 1 shows a side elevation, partly in section, of a die stock with the guide structure in place.

Fig. 2 shows a plan view of the member supporting the guide devices.

Fig. 3 shows a plan view of the cam member.

Figs. 4, 5 and 6 show side elevations of the guide devices, or guide bars.

Fig. 7 shows plan view of locking plate.

I marks the body of the die stock. This has the guide shoulders 2 for positioning the chasers 3. The chasers are secured by screws 4 and are adjustable through the action of screws 5. The stock is provided with the usual handles 6 and is provided with a guide opening 1 through which the pipe extends as it is operated upon by the chasers.

The guide structure has a shank 8 which is detachably secured in the opening 1 in the body of the stock by means of a screw 9. The shank 8 extends from a supporting member ID. This is provided with radially extending ribs H which provide guide slots l2.

Guide devices in the form of bars I3 are slidingly mounted in the slots l2. A cam plate M has cam surfaces, as provided, Ma. These, as shown are surfaces forming a continuous scroll and these engage projections [3a on the guide bars l3.

The cam member l4 has a peripheral shoulder l5 which forms a rotative fit on the periphery of the supporting member Ill. The cam member has radial ears l6 at its periphery in which are arranged sockets l1. Openings l8 extend through the bottoms of the sockets. Pins l9 extend through the openings I8 and are provided with heads 20 forming sliding fits with the walls of the sockets I1. Springs 2i are arranged in the sockets between the heads and the bottoms of the sockets and yieldingly exert pressure against the heads of the pins. Locking heads 22 are arranged on the ends of the pins l9 and overlap the surface of the supporting member. The pins are provided with grooves 23 which receive looking plates 24, these plates 24 having slots 25 which permit the plates to be positioned on the pins I9 with the edges of theslots 25 in the slot 23. Ribs 26 are arranged on the periphery of the locking head 22 and thus retain the locking plates 24 in place.

The parts It and I4 are assembled with the guide devices l3 in place. The heads 22 are arranged on the pins and the pins forced inwardly for enough to permit the positioning of the looking plates in the grooves 23. The release of the pins draws the locking plates down within the ribs 26 and the pressure of the springs drawing the members Ill and M together exerting friction between the guide devices l3 and the walls of the members I0 and M as well as between the edges of the heads 22 and the member [0.

In this way a very simple means of assembly is provided, one that may be very readily taken apart to permit the introduction of different lengths of guide devices, or bars, and one which provides a very effective retarding means for holding the members I0 and I4 rotatively against movement from their desired point of adjustment. Thus all that is necessary to adjust the guide structure for a different size is to turn the rotative member to provide the proper adjustment for the guide bar and the yielding spring action will retain the guide members in the adjusted position. If desired, one guide structure can be readily substituted for another and as stated one set of guide members may be substituted for those used without the use of auxiliary tools for effecting these operations.

What I claim as new is:-

1. In an adjustable die stock guide structure, the combination of a cam member having cam surfaces; a guide supporting member; guide devices mounted on the supporting member and actuated radially by the cam surfaces in response to relative rotative movement of the members; and means comprising a plurality of springpressed pins on one of the members and having heads overlapping the companion member.

2. In an adjustable die stock guide structure, the combination of a cam member having cam surfaces; a guide supporting member; guide devices mounted on the supporting member and actuated radially by the cam surfaces in response to relative rotative movement of the members; and means comprising a plurality of springpressed pins on one of the members and having detachable heads overlapping the companion member.

3. In an adjustable die stock guide structure, the combination of a cam member having cam surfaces; a guide supporting member; and guide devices mounted on the supporting member and actuated radially by the cam surfaces in response to relative rotative movement of the members, one of the members being provided with a plurality of sockets adjacent its periphery, headed pins arranged in the sockets and extending through the member having the sockets, springs between the heads of the pins and the bottoms of the sockets, and detachable heads on the pins engaging the companion member.

4. In an adjustable die stock guide structure, the combination of a cam member having cam surfaces; a guide supporting member; and guide devices mounted on the supporting member and actuated radially by the cam surfaces in response to relative rotative movement of the members, one of the members being provided with a plurality of sockets adjacent its periphery, headed pins arranged in the sockets and extending through the member having the sockets, said pins being provided with grooves at the protruding ends, detachable heads arranged on the protruding ends and overlapping the companion member, said heads having peripheral shoulders, and locking plates removably positioned in the grooves on the pins and locked in position by the shoulders on the detachable heads.

THORVALD PETERSEN. 

